Statistical chronometry of meteorites. I. A Test of 26Al homogeneity and the Pb-Pb age of the solar system’s $t=0$

Desch, Steven J.; Dunlap, Daniel R.; Dunham, Emilie T.; Williams, Curtis D.; Mane, Prajkta

doi:10.1016/j.icarus.2023.115607

Title: Statistical chronometry of meteorites. I. A Test of ²⁶Al homogeneity and the Pb-Pb age of the solar system’s $t=0$

Journal Article · 05 May 2023 · Icarus

DOI: https://doi.org/10.1016/j.icarus.2023.115607 · OSTI ID:1993704

^[1]; Dunlap, Daniel R. ^[2]; Dunham, Emilie T. ^[3]; Williams, Curtis D. ^[4]; Mane, Prajkta ^[5]

Arizona State Univ., Tempe, AZ (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Univ. of California, Los Angeles, CA (United States)
Univ. of California, Davis, CA (United States)
Universities Space Research Association, Houston, TX (United States). Lunar and Planetary Institute

Here, we use rapidly cooled achondrites to test the assumption of ²⁶Al homogeneity in the solar nebula, by checking if there is a single value of t_SS, the absolute “Pb-Pb” age of the Solar System’s t=0, that makes concordant their ages from the Al-Mg and Pb-Pb systems. We find that values t_SS=4568.42 ± 0.24 Myr do make these ages concordant, and therefore the hypothesis of homogeneous ²⁶Al is not falsified. This age, defined to be when the solar nebula had (²⁶Al/²⁷Al) = 5.23 × 10^–5, is significantly older than the ≈ 4567.3 Myr inferred from direct measurements of Pb-Pb ages in CAIs. Discrepancies between the Al-Mg and Pb-Pb chronometers in chondrules and CAIs have previously been interpreted as arising from heterogeneities in ²⁶ Al, under the presumption that the Al-Mg and Pb-Pb systems in CAIs closed simultaneously. We examine this assumption and show that resetting is to be expected in CAIs. In particular, we quantitatively demonstrate that it is plausible that Pb-Pb ages of CAIs were reset at late times, without resetting the earlier Al-Mg ages, if they were transiently heated in the same manner as chondrules. We critically examine Pb-Pb isochrons, refining data and suggesting best practices for their calculation and reporting. We advocate reporting chronometry as times of formation after t=0 rather than absolute ages, as only the former is useful for astrophysical models of the solar nebula. We advocate averaging of multiple samples, rather than anchoring to individual meteorites, to improve precision.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: National Aeronautics and Space Administration (NASA); USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1993704

Journal Information:: Icarus, Journal Name: Icarus Journal Issue: 1 Vol. 402; ISSN 0019-1035

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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